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/**
* Tick granularity by life stage.
*
* One tick represents a different span of time depending on the character's
* age — infancy advances in years because there isn't weekly texture worth
* resolving, adulthood in weeks because that's the rhythm the design lives
* at. See docs/05-time-system.md and ARCHITECTURE.md §5.
*/
export type LifeStage =
| 'infancy'
| 'early_childhood'
| 'middle_childhood'
| 'adolescence'
| 'young_adult'
| 'middle_adult'
| 'late_adult'
| 'elderly'
export type TickUnit = 'year' | 'season' | 'month' | 'week'
export const TICK_UNIT_BY_LIFE_STAGE: Readonly<Record<LifeStage, TickUnit>> = {
infancy: 'year',
early_childhood: 'season',
middle_childhood: 'season',
adolescence: 'month',
young_adult: 'week',
middle_adult: 'week',
late_adult: 'week',
elderly: 'month'
}
export function lifeStageForAge(ageYears: number): LifeStage {
if (ageYears < 0) throw new Error(`Invalid age: ${ageYears}`)
if (ageYears < 3) return 'infancy'
if (ageYears < 7) return 'early_childhood'
if (ageYears < 13) return 'middle_childhood'
if (ageYears < 18) return 'adolescence'
if (ageYears < 30) return 'young_adult'
if (ageYears < 60) return 'middle_adult'
if (ageYears < 76) return 'late_adult'
return 'elderly'
}
export function tickUnitForAge(ageYears: number): TickUnit {
return TICK_UNIT_BY_LIFE_STAGE[lifeStageForAge(ageYears)]
}
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